What does code P274D mean?

Q: What does code P274D mean?

Transmission Fluid Temperature Sensor C Circuit High. P274D indicates that the transmission control module (TCM) has detected an abnormally high voltage on the signal circuit for transmission fluid temperature sensor C, which is typically a thermistor whose resistance drops as fluid temperature rises. The TCM interprets this high voltage as an open circuit or a sensor reporting an impossibly cold temperature, and it may substitute a default temperature value while logging the fault.

DTC codes / P27xx · Transmission / P274D

P274DTransmission Fluid Temperature Sensor C Circuit High

P274D indicates that the transmission control module (TCM) has detected an abnormally high voltage on the signal circuit for transmission fluid temperature sensor C, which is typically a thermistor whose resistance drops as fluid temperature rises. The TCM interprets this high voltage as an open circuit or a sensor reporting an impossibly cold temperature, and it may substitute a default temperature value while logging the fault.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.